Possible to change interlaced mode without re-encoding?

[szabi]

Hi

My video source was an interlaced one.
I re-encoded it for smaller size by megui+x264.
I did not use any deinterlace method in avisynth.
And now the output is flagged as progressive one.
I do not understand there was no modification for interlaced, why the encoded movie flagged as progressive.
Why the original flag was not kept?

EDIT: I missed the settings in x264.
If interlaced video is the source the interlace mode has to be set other than default for x264.
Are there any way to change it without re-encoding?

[Guest]

So you encoded an interlaced stream as progressive when you intended to retain the interlacing. You must re-encode.

The original flagging is not retained because your Avisynth script delivers uncompressed video without any syntax elements. x264 does not know whether the input is interlaced unless you specify it.

[szabi]

Hi

Right now, the video was re-encoded.
Since now I learnt something new. :)

bye
szabi